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09-09-2021, 03:51 AM
Between slow spool, no boost, black soot, rattle, and white smoke it sounds like your turbos are done. Hard to say for sure without seeing/hearing the car in person or more data, though.
How do the turbos sound? Can you hear them? Might not be as easy to tell without intakes and ***.
Anyways, I went through a few sets of OEM turbos and can't say I ever noticed any of the idle, exhaust sound, or other symptoms you're mentioning. That's my only hesiation to turbos and wondering if there's another issue or a combination of things.
2007 335i - JB4 + MHD BEF, RB Twos Plus, PI + Stage 3 LPFP, 100% E85, BMS DCI, VRSF **, VRSF 7.5" FMIC, VRSF CP w/ TiAL BOV, MMP inlets, VRSF aluminum outlets, XHP Stage 3, TC Kline SA, M3 F/R control arms
2008 535i
N54
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